Paper product and a method and a system for manufacturing furnish

ABSTRACT

The invention relates to a method for manufacturing furnish for a paper product, wherein the manufactured furnish contains fibril cellulose material. The method includes introducing first raw material to a system, which first raw material includes cellulose pulp, introducing second raw material to the system, which second raw material includes cellulose fibers that are oxidized by nitroxyl-mediated oxidation of hydroxyl groups of the cellulose, conveying the first raw material and the second raw material to a refiner, and refining and mixing the first raw material and the second raw material in the refiner in order to produce furnish including fibril cellulose material. In addition, this invention relates to a system for manufacturing furnish and to a paper product.

FIELD OF THE INVENTION

This invention relates to a method and a system for manufacturingfurnish for a paper product, which furnish comprises fibril cellulosematerial. In addition, this invention relates to a paper product.

BACKGROUND OF THE INVENTION

Cellulose, which is an abundant natural raw material, is apolysaccharide consisting of a linear chain of several hundreds to tenthousand linked D-glucose units. Cellulose fibers can be refined with arefiner or a grinder to produce fibril cellulose material. Typically,the production of fibril cellulose material requires a significantamount of beating energy. Therefore, there may be an efficiency problemwith said material production.

SUMMARY OF THE INVENTION

The present invention discloses a method and a system for manufacturingpulp comprising fibril cellulose. In addition, the invention discloses apaper product comprising fibril cellulose.

The present invention is based on a usage of fibril cellulose in paperfurnish. The inventors of the present invention have surprisingly founda way to produce cellulose material with increased productionefficiency. Fibril cellulose as such may provide a paper product withnew functional properties. Moreover, due to the present invention, itmay be possible to achieve a simple fibril cellulose process with lowenergy consumption. The produced pulp comprising fibril cellulose may beused, for example, as a strength additive for a paper product.

According to the present invention, anionized cellulose fibres are fedtogether with cellulose pulp, such as mechanical pulp or chemical pulp,preferably together with chemical pulp, through beating process in apaper machine approach system.

Aspects of the invention are characterized by what is stated in theindependent claims 1, 6 and 8. Various embodiments of the invention aredisclosed in the dependent claims.

In the method according to the present invention, wherein themanufactured furnish contains fibril cellulose material, the methodadvantageously comprises:

-   -   introducing first raw material to a system, which first raw        material includes cellulose pulp,    -   introducing second raw material to the system, which second raw        material comprises anionized cellulose fibers that are oxidized        by nitroxyl-mediated oxidation of hydroxyl groups of the        cellulose,    -   conveying the first raw material and the second raw material to        the same refiner,    -   refining and mixing the first raw material and the second raw        material in the refiner in order to produce pulp comprising        fibril cellulose material.

In the system according to the present invention, wherein themanufactured furnish contains fibril cellulose material, the systemcomprises:

-   -   first means for introducing first raw material to a system,        which first raw material comprises cellulose pulp (2),    -   second means for introducing second raw material to the system,        which second raw material comprises cellulose fibers that are        oxidized by nitroxyl-mediated oxidation of hydroxyl groups of        the cellulose,    -   at least one conveyer to convey the introduced raw materials to        at least one refiner (8),    -   the at least one refiner (8) to refine and to mix the first raw        material and the second raw material in order to produce the        furnish comprising fibril cellulose material (4).

Thanks to the present invention which may solve several issues of fibrilcellulose usage on a paper machine, it may be possible to achieve atleast some of the below mentioned advantages:

-   -   quite simple (i.e. quite inexpensive) system for fibril        cellulose process,    -   transportation of low solids content fibril cellulose may be        avoided,    -   efficient mixing of basic furnish and fibril cellulose may be        guaranteed during beating process,    -   complicated dosing aggregates may not be needed in a paper        machine approach system, and    -   paper properties may be improved without significant loss of        drainage speed.

Due to the present invention, for example a separate fibrillatingprocess taking place in low solids content is not necessarily needed.Therefore, the invention may significantly simplify the start-up offibril cellulose usage, because some large investments, such asinstallation of separate fibrillating aggregates, may be avoided.

DESCRIPTION OF THE DRAWINGS

In the following, the invention will be illustrated by drawings in which

FIGS. 1 a-1 d show schematically some example embodiments of theinvention, and

FIGS. 2-8 show results from experimental tests.

DETAILED DESCRIPTION OF THE INVENTION

In the following disclosure, all percentages are by dry weight, if notindicated otherwise.

The following reference numbers are used in this application:

-   2 cellulose pulp,-   2 a chemical cellulose pulp,-   3 anionized cellulose fibres,-   4 fibril cellulose material,-   5 chemical pre-treatment,-   8 refiner, and-   10 refined cellulose pulp.

Cellulose is a renewable natural polymer that can be converted to manychemical derivatives. The derivatization takes place mostly by chemicalreactions of the hydroxyl groups in the β-D-glucopyranose units of thepolymer. By chemical derivatization the properties of the cellulose canbe altered in comparison to the original chemical form while retainingthe polymeric structure.

The term “cellulose raw material” refers to any cellulose raw materialsource that can be used in the production of chemically and/ormechanically treated cellulose fibers. The raw material can be based onany plant material that contains cellulose. The plant material may bewood. The wood can be from softwood trees such as spruce, pine, fir,larch, douglas-fir or hemlock, or from hardwood trees such as birch,aspen, poplar, alder, eucalyptus or acasia, or from a mixture ofsoftwood and hardwood. Nonwood material can be from agriculturalresidues, grasses or other plant substances such as straw, leaves, bark,seeds, hulls, flowers, vegetables or fruits from cotton, corn, wheat,oat, rye, barley, rice, flax, hemp, manila hemp, sisal hemp, jute,ramie, kenaf, bagasse, bamboo or reed.

The term “chemical (cellulose) pulp” 2 a refers to cellulose fibers,which are isolated from any cellulose raw material or any combination ofcellulose raw materials by a chemical pulping process. Therefore, ligninis at least for the most part removed from the cellulose raw material.Chemical pulp 2 a is preferably sulfate wood pulp. In an example, thechemical pulp is isolated from softwood and/or from hardwood. The usedchemical pulp 2 a may be unbleached or bleached. Typically, the diameterof the fibers varies from 15 to 25 μm and the length exceeds 500 μm, butthe present invention is not intended to be limited to these parameters.

The term “mechanical (cellulose) pulp” refers to cellulose fibers, whichare isolated from any cellulose raw material by a mechanical pulpingprocess. The mechanical pulping process could be preceded by a chemicalpretreatment, producing chemimechanical pulp. The cellulose fibers usedin this invention preferably comprise mechanically and/or chemicallyand/or chemimechanically treated cellulose fibers. Herein they are alsoreferred as “raw material pulp 2” or “cellulose pulp 2”. Therefore,cellulose pulp 2 may consist of chemical cellulose pulp and/ormechanical pulp and/or chemi-mechanical pulp.

The term “SEC” refers to specific energy consumption.

The term “SR” refers to so called Schopper-Riegler freeness of pulp.

The term “WRV” refers to water retention value.

It is possible to use fibril cellulose 4 in mechanical pulp containingpapers, such as printing paper. The method according to the presentinvention may be used, for example, in Light Weight Coated (LWC) orSuper Calendered (SC) papers. Advantageously the method according to thepresent invention is used in paper grades having high chemical pulpshare, i.e. in papers comprising more chemical pulp 2 a than mechanicalpulp. In an embodiment, at least 80% of dry weight, more preferably atleast 90% of dry weight and most preferably at least 95% of dry weightof the cellulose fibers used in this invention is from chemical pulp 2a.

The term “fibril cellulose” 4 refers to a collection of isolatedcellulose microfibrils or microfibril bundles derived from cellulose rawmaterial. There are several widely used synonyms for fibril cellulose.For example: nanofibrillated cellulose (NFC), nanocellulose,microfibrillar cellulose, nanofibrillar cellulose, cellulose nanofiber,nano-scale fibrillated cellulose, microfibrillated cellulose (MFC), orcellulose microfibrils. Fibril cellulose described in this applicationis not the same material as the so called cellulose whiskers, which arealso known as: cellulose nanowhiskers, cellulose nanocrystals, cellulosenanorods, rod-like cellulose microcrystals or cellulose nanowires. Insome cases, similar terminology is used for both materials, for exampleby Kuthcarlapati et al. (Metals Materials and Processes 20(3):307-314,2008) where the studied material was called “cellulose nanofiber”although they clearly referred to cellulose nanowhiskers. Typicallythese materials do not have amorphous segments along the fibrillarstructure as fibril cellulose, which leads to a more rigid structure.Cellulose whiskers are also shorter than fibril cellulose.

The anionization of the cellulose fibers, preferably chemical pulp, ispreferably implemented by a reaction wherein the primary hydroxyl groupsof cellulose are oxidized catalytically by a heterocyclic nitroxylcompound. Other heterocyclic nitroxyl compounds known to haveselectivity in the oxidation of the hydroxyl groups of C-6 carbon of theglucose units of the cellulose can also be used. Advantageously, theprimary hydroxyl groups of cellulose are oxidized first, after which thematerial is refined at least partly into fibril cellulose.

The charge (ieq/g) of the anionized cellulose fibers is preferablybetween −700 and −1200, for example between −900 and −1100.

The term “oxidation of cellulose” refers to the oxidation of thehydroxyl groups (of cellulose) to aldehydes and/or carboxyl groups. Itis preferred that the hydroxyl groups are oxidized to carboxyl groups,i.e. the oxidation is complete, before the refining step in a refiner isimplemented. “Catalytic oxidation” refers to nitroxyl-mediated (suchas“TEMPO”-mediated) oxidation of hydroxyl groups. The term“TEMPO-treated” refers to a material that is treated with so called“TEMPO” chemical, i.e. 2,2,6,6-tetramethylpiperidinyl-1-oxy freeradical.

The “catalytic oxidation of fibrous material” in turn refers to amaterial which contains cellulose that is oxidized by nitroxyl-mediated(such as “TEMPO”-mediated) oxidation of hydroxyl groups of thecellulose. In addition, also the terms “anionized cellulose fibers” and“anionized cellulose material” 3 are used, referring to a materialcomprising at least 90 w-% (of dry weight) cellulose material, morepreferably consisting of cellulose material, in which cellulose isoxidized by nitroxyl-mediated (such as “TEMPO”-mediated) oxidation ofhydroxyl groups of the cellulose.

Advantageously the chemical pulp 2 a, which may be produced fromsoftwood and/or from hardwood, is extensively oxygenated in the presenceof catalytic oxidation, such as TEMPO-mediated oxidation in order toproduce anionized cellulose fibres 3. The anionized cellulose fibres 3have a high anionic charge and, thus, said anionized fibres arerelatively easily fibrillated under shear forces.

Advantageously, cellulose pulp 2 and anionized cellulose material 3 arecombined with each other before at least one refiner step in at leastone refiner 8. The refiner 8 is preferably a grinder or a refiner, suchas a conical refiner or a disc refiner or a cylindrical refiner. In anaspect of the invention, at least one refiner 8 is a grinder, ahomogenizer, a colloider, a friction grinder, a fluidizer or anultrasound sonicator.

The anionized cellulose material 3 is added to the cellulose pulp 2which is going to a refiner 8 in a paper machine approach system. Theanionized material 3, such as tempo-treated pulp, is fibrillated due toshear forces and energy consumed during the beating process. Mostpreferably the cellulose pulp 2 to be refined together with theanionized cellulose material 3 comprises unbeaten chemical pulp 2 a, butsaid cellulose pulp 2 may also comprise beaten chemical pulp and/ormechanical pulp.

Advantageously, the furnish comprising cellulose pulp 2 and anionizedcellulose material 3 to be conveyed to the refiner 8 comprises between0.3 and 5% of dry weigh, more preferably between 0.6 and 3% of dryweight, and most preferably between 1 and 2% of dry weight cellulosefibers which are oxidized by nitroxyl-mediated oxidation of hydroxylgroups of the cellulose. The cellulose pulp 2 may comprise chemical pulpand/or mechanical pulp. It is also possible to add some additionalcellulose pulp(s) after said refiner 8.

The amount of the fibril cellulose in the manufactured paper furnish ispreferably between 0.1 and 5.0% of the pulp (dry weight), morepreferably between 0.3 and 4% (dry weight), and most preferably between1 and 2 (dry weight) of the manufactured furnish. The amount iscalculated from the whole furnish, including the fibre and the possiblefiller.

The amount (sum) of the anionized cellulose material 3 and fibrilcellulose 10 in a base paper product (before any possible coating step)and/or in the furnish is preferably between 0.01-10.0% or dry weight,more preferably between 0.05 and 5.0% of dry weight and the mostpreferably between 0.5 and 2.0% of dry weight.

Due to the chemical pre-treatment of the cellulose fibers, charge ofcellulose fibrils increases, hence repulsion forces between fibrilsincrease. In order to achieve efficient fibrillation process, a highoxygenation rate is required. Advantageously, the charge of theanionized cellulose fibers is between −900 and −1100 ieq/g.

According to the present invention, the chemical pre-treatment 5 of thecellulose pulp 2 (in order to produce anionized cellulose material 3)may be a part of the solution for manufacturing paper furnish (as shownin FIGS. 1 a and 1 d), or the chemical pre-treatment 5 may beimplemented in another process.

Cationic polyelectrolyte, such as starch, is preferably dosed to thecellulose pulp (2) before the dosage of fibril cellulose material (4).Cationic polyelectrolyte can be any retention or strength polymer usedin paper manufacturing, e.g. cationic starch, cationic polyacrylamide(CPAM) or polydimethyldiallyl ammonium chloride (PDADMAC). Also, thecombinations of the different polyelectrolytes can be used. Preferably,the cationic polyelectrolyte is cationic starch (CS). The cationicpolyelectrolyte is added in an amount of 0.01 to 5% of dry weight offibres in the furnish, preferably approximately 0.10 to 1.00% of dryweight.

Thanks to the present invention, it is possible to mix cellulose pulp 2with anionized chemical material 3 efficiently while at least some ofthe anionized cellulose material 3 is fibrillated into fibril cellulose4 in at least one refiner 8. Therefore, fibril cellulose 4 may be mixedfor example with cellulose pulp 2, such as chemical pulp 2 a, withoutany separate mixing and fibrillating aggregates, i.e. an additionalmixer may not be required.

According to the present invention, it is possible to avoidtransportation of low solids fibril cellulose having the consistency of5% at the most. In fibril cellulose production, the concentration offibril cellulose in dispersions is typically very low, usually around1-5%. Therefore the logistic costs are typically too high to transportthe material from the production site. The specific surface area offibril cellulose is very large due to its nanoscopic dimensions, andconcentration or drying of fibril cellulose hydrogel is challenging.Respectively, strong water retention is natural for fibril cellulosesince water is bound on the surfaces of the fibers through numeroushydrogen bonds.

Thanks to the present invention, the fibril cellulose 4 may be producedin the paper mill, i.e. in “on-site fibril cellulose production”, evenwithout need for complicated dosing aggregates in the paper machineapproach system. According to an embodiment of the invention, a storagetank, dilution water and dosing pumps are needed to feed said anionizedcellulose material 3 to the main pulp line going to beating. Thus, thepresent invention is advantageously a simplified fibril cellulose dosingprocess.

The novel solution may be a cost effective way of using fibril cellulosein wet end applications. The invention may cause an effective dispersingof fibril cellulose and a proper mixing with base furnish.

A paper produced from the pulp manufactured according to the presentinvention may have many advantages. For example, the grammage of thepaper may be decreased and/or the amount of the filler in use may beincreased and/or strength properties of the produced paper may beincreased. In addition, the amount of the needed silicone coating on arelease paper may be decreased due to the new properties of the producedpaper.

The paper comprising (at least mostly, i.e. at least 60% of dry weight,more preferably at least 75% and the most preferably at least 90% of dryweight) or consisting of the pulp manufactured according to theinvention is preferably a release paper of a label laminate. The releasepaper is typically strongly refined, hence, the chemically treatedcellulose may be refined into fibril cellulose efficiently.Advantageously, the basis weight range of the manufactured paper isbetween 30 and 90 g/m², more preferably between 30 and 50 g/m². Theproduced paper may be coated and/or surface sized and/or calendered.

The label laminate preferably comprises two layers which are laminatedtogether, i.e. a release liner and a face layer, wherein an adhesivelayer is provided between the release liner and the face layer. The term“face layer” refers to “the top layer” of the label laminate, alsocalled as the face stock.

The face layer comprises at least one layer that is attached to anothersurface with an adhesive layer, when the label laminate is used.

The term “release liner” refers to a structure comprising at least onebacking material layer as base material and at least one release coatinglayer on the backing material layer. In other words, the backingmaterial layer is usually coated with a thin layer of release agent,such as silicone. Therefore, the release liner can be easily removedfrom the face layer when the label is adhered to a substrate. Herein,the term “release paper” refers to said backing material.Advantageously, the produced paper is coated with at least one siliconcoating layer in order to produce a release liner for a label laminate.

The pulp from which the handsheet is made is preferably collected fromthe pulp flow that is going to a headbox of a paper machine. In otherwords, the pulp preferably comprises every compounds of the base paperto be manufactured, such as fillers, chemicals, pulps etc., but theprocess parameters of the paper machine cannot have any effect on theresults. Typically, fibril cellulose added in small amount in paper hasone, two, three or four of the following effects on handsheet, if thehandsheet is manufactured from the pulp produced according to thepresent invention:

-   -   Clearly lower air permeance if compared to a reference        handsheets.    -   Improved initial wet strength if compared to a reference        handsheets.    -   Improved Scott Bond if compared to a reference handsheets .    -   Higher SR or WRV without adjusting beating if compared to a        reference handsheets.

These properties are also presented in Table 2.

EXPERIMENTAL TESTS

In the experimental tests, different kinds of pulps for paper productswere manufactured. Paper sheets were made from the produced pulps andtested afterwards.

Raw Materials and a Trial Plan

-   -   Chemical pulps made with a conventional chemical pulping process        were used as cellulose pulp 2. The chemical pulps used were        isolated from pine (so called “Kaukas Pinus” manufactured by        UPM) and from birch (so called “Kaukas Betula” manufactured by        UPM).    -   The trial was carried out according to the plan presented in        Table 1. SEC, pulp type (Birch, Pine), amount of the anionized        cellulose material (“TEMPO pulp”), amount of the readymade        fibril cellulose (TEMPO MFC), a place where the fibril cellulose        was added and amount of starch were varied as shown in Table 1.

TABLE 1 Trial plan. Birch/ pine Birch/ TEMPO TEMPO Starch/ MFC additionmixture TP Birch Pine Pine pulp MFC mg/g to SEC/kWh/t 0 70 30 100 200 170 30 100 10 200 2 70 30 100 20 200 3 70 30 100 30 200 4 70 30 98 2 10beating 200 5 70 30 98 2 20 beating 200 6 70 30 98 2 30 beating 200 7 7030 98 2 10 beating 200 8 70 30 98 2 20 beating 200 9 70 30 98 2 30beating 200 10 70 30 98 2 20 pulp after starch 200 11 70 30 98 2 10 pulpafter starch 200 12 70 30 98 2 20 pulp after starch 200 13 70 30 98 2 30pulp after starch 200 14 70 30 98 2 20 beating 250 15 70 30 98 2 20beating 300

-   -   Fibril cellulose material was dispersed with Bamix®·hand mixer        for 2 minutes before the dispersed fibril cellulose was added to        the chemical pulp. The mixture did not comprise fillers. Starch        (Raisamyl 50021) was added to the chemical pulp. If fibril        cellulose was added before the beating step, the mixing time of        the mixture comprising fibril cellulose, chemical pulp and        starch was 20 min. If fibril cellulose was added after the        beating step, starch and cellulose pulp were mixed with each        other, wherein the mixing time was 15 min, after which fibril        cellulose was added to the mixture. The mixing time of mixture        comprising starch, chemical pulp and fibril cellulose was in        this case 5 min. A 100 mesh wire was used in the trial.

TEST RESULTS

Summary of the test results is shown in Table 2, wherein

Internal 1: Drainage time was defined by the time until visible waterdisappears during sheet forming,

and

Internal 2: Wet tensile strength was measured with L&W tensile testerfrom wet sheets. Two solids content levels were used in which solidscontent of sheets were between 35 and 50%, and the results wereinterpolated to 45% solids content

TABLE 2 Summary of the test results. Tempo pulp 2%, Tempo Tempo TempoReference, cationic fibrils 2%, pulp 2%, pulp 2%, cationic starch 20cationic cationic cationic starch 20 mg/g, starch 20 starch 20 starch 20mg/g, 200 200 mg/g, 200 mg/g, 250 mg/g, 300 Paper property Method kWh/tkWh/t kWh/t kWh/t kWh/t Drainage time Internal 19 21 24 46 150 duringsheet 1 forming/s Tensile index/ ISO 115 110 113 109 106 Nm/g 1924-3Bonding strength T 569 1496 1613 1930 1717 >2000 SB High/J/m² pm-07 Airpermeance ISO 11 8 9 3 2 Bendtsen/ml/min 5636-3 Wet web tensile Internal8.8 10.3 8.9 10.3 10.8 index at 45% solids/ 2 Nm/g

-   -   Fibril cellulose addition clearly increased the SR level of the        produced pulp. It was noticed that SEC at approximately 225        kWh/t would have brought the SR level of Tempo pulp containing        furnish to the level of Tempo fibrils containing furnish beaten        at 200 kWh/t SEC. Examples of SR levels are shown in FIG. 2.    -   The results showed generally higher water retention values (WRV)        with pulps comprising fibril cellulose material than with        reference pulps without fibril cellulose material. It was        noticed that SEC approximately at 225 kWh/t would have brought        the WRV-level of Tempo pulp containing furnish to the level of        Tempo fibrils containing furnish beaten at 200 kWh/t SEC. Some        water retention values are shown in FIG. 3.    -   According to the trials, increased beating energy consumption        was not necessary when Tempo-treated pulp was fibrillated during        beating. The SR and WRV levels of beaten pulp were lower than in        case of ready-made Tempo-fibril addition to beaten pulp.    -   Sheet properties results are based on laboratory sheets.        Anionized cellulose fibers added to the beating step seemed to        give good paper sheet properties. In FIGS. 4-7, “T” refers to        “Tempo treated”.    -   Air permeability of the pulp comprising fibril cellulose was        clearly lower than air permeability of the reference pulp. In        addition, results showed lower porosity, when fibrils were added        to beaten pulp instead of unbeaten pulp. Tempo pulp and Tempo        fibrils were approximately at the same level when added to        beating. Air permeability results are shown in FIG. 4.    -   For Scott Bond, Tempo fibrils seemed to be slightly more        effective than Tempo pulp. Tempo addition to unbeaten pulp        seemed to be more effective than addition to unbeaten pulp.        Scott Bond results are shown in FIG. 5.    -   For Tensile index, a good performance was shown with Tempo pulp        added to beaten pulp. Tempo pulp and fibrils added to beating        seemed to be slightly better than when fibrils were added to        beaten pulp, or at least as good as when fibrils were added to        beaten pulp. Tensile indexes are shown in FIG. 6.    -   For wet tensile strength at 45% solids content, a good        performance was shown with Tempo pulp added to beating and Tempo        fibrils added to beaten pulp. This is shown in FIG. 7.    -   Drainage was comparable to reference samples but with higher        strength properties. Tempo-treated fibrils and Tempo-treated        pulp with higher SEC gave most dense sheet but also slowest        drainage.    -   FIG. 8 shows results of a test run in a mill scale where        Tempo-treated pulp was supplied to a refiner together with        untreated pulp. The diagram shows the air permeability of the        paper made of the obtained refined pulp in as Bekk air        resistance (s/10 ml). The middle column, representing the test        made with the mixed pulp, shows clearly increased air resistance        compared with reference runs, which means lower permeability.        The energy consumption was also lower by 10% in the test run.

It can be easily seen from the refining results of the experimentaltests that SR and WRV are increased with the refining step of thechemical pulp and Tempo pulp clearly more than refining step of thechemical pulp without Tempo pulp, thus, Tempo pulp is clearlyfibrillated into fibril cellulose material during the refining step.

Thanks to the present invention, a production of fibril cellulose forpaper applications may be possible with low energy consumption. Oneskilled in the art understands readily that the different embodiments ofthe invention may have applications in environments where optimizationof a paper product comprising fibril cellulose is desired. Therefore, itis obvious that the present invention is not limited solely to theabove-presented embodiments, but it can be modified within the scope ofthe appended claims.

1-15. (canceled)
 16. A method for manufacturing furnish for a paperproduct, comprising: introducing first raw material to a system, saidfirst raw material comprising cellulose pulp, introducing second rawmaterial to the system, said second raw material comprising anionizedcellulose fibers prepared by nitroxyl-mediated oxidation of hydroxylgroups of the cellulose, conveying the first raw material and the secondraw material to a refiner, refining and mixing the first raw materialand the second raw material in the refinerin order to produce furnishcomprising fibril cellulose material.
 17. The method according to claim16, wherein the sum of the fibril cellulose and the anionized cellulosefibers in the manufactured furnish is between 0.01-10.0% of dryweight.18. The method according to claim 16, wherein the amount of the fibrilcellulose in the manufactured furnish is between 0.1 and 5.0 dry weightpercent.
 19. The method according to claim 16, wherein the first rawmaterial comprises chemical pulp.
 20. The method according to claim 16,wherein the refiner is placed in a paper machine approach system.
 21. Asystem for manufacturing furnish for a paper product, the systemcomprising: first means for introducing first raw material to a system,which first raw material comprises cellulose pulp, second means forintroducing second raw material to the system, which second raw materialcomprises cellulose fibers oxidized by nitroxyl-mediated oxidation ofhydroxyl groups of the cellulose, at least one refiner, at least oneconveyer to convey the introduced raw materials to said at least onerefiner, said at least one refiner being configured to refine and to mixthe first raw material and the second raw material in order to producefurnish comprising fibril cellulose material.
 22. The system accordingto claim 21, wherein the refiner is placed in a paper machine approachsystem.
 23. A paper comprising fibril cellulose material, wherein thefibril cellulose material is produced by refining from cellulosematerial comprising first raw material comprising cellulose pulp andsecond raw material comprising cellulose fibers oxidized bynitroxyl-mediated oxidation of hydroxyl groups of the cellulose.
 24. Thepaper according to claim 23, wherein the paper has at least one of thefollowing: improved bonding strength properties, improved wet webtensile index, and lowered air permeability properties.
 25. The paperaccording to claim 23, wherein the paper is a release paper for a labellaminate.
 26. The paper according to claim 23, wherein the paper issandpaper base.
 27. The paper according to claim 23, wherein the paperis a printing paper.
 28. The paper according to claim 23, wherein thepaper is a packing material and/or a paperboard.
 29. The paper accordingto claim 23, wherein the amount of the fibril cellulose in the paper isbetween 0.5 and 2.5 w-%.
 30. A use of a furnish for manufacturing ofpaper or paperboard, wherein at least part of the furnish ismanufactured according to the method of claim
 16. 31. The methodaccording to claim 17, wherein the amount of the fibril cellulose in themanufactured furnish is between 0.1 and 5.0 dry weight percent.
 32. Themethod according to claim 17, wherein the first raw material compriseschemical pulp.
 33. The method according to claim 18, wherein the firstraw material comprises chemical pulp.
 34. The method according to claim17, wherein the refiner is placed in a paper machine approach system.35. The method according to claim 18, wherein the refiner is placed in apaper machine approach system.